<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        header,nav{
            height: 150px;
            background-color: blue;
            border-radius: 15px;
            width: 800px;
            margin: 15px auto;
        }
        article{
            height: 500px;
            background-color: yellow;
            border-radius: 15px;
            width: 800px;
            margin: 15px auto;
        }
        search{
            height: 50px;
            background-color: green;
            border-radius: 15px;
            width: 800px;
            margin: 15px auto;
        }
        aside{
            height: 300px;
            background-color: purple;
            border-radius: 15px;
            width: 300px;
            margin: 15px auto;
        }
        footer{
            height: 100px;
            background-color: red;
            border-radius: 15px;
            width: 800px;
            margin: 15px auto;
        }
    </style>
</head>
<body>
    <header>头部标签</header>
    <nav>导航标签</nav>
    <article>内容标签</article>
    <search>定义文档某个区域的搜索功能</search>
    <aside>侧边栏标签</aside>
    <footer>页脚标签</footer>

</body>
</html>